Thats called Colluding. Yes that happens a lot on Seals. If you ever feel someone is colluding, then you should email support.
The bad part is that they won't confirm if collusion was actually happening, and that makes it worthless to report, as firstly, you do not get any refund if it was happening. You don't even know if they were banned for colluding, as more players mean more rake for seals, and Seals freezes their accounts and keeps their balance to themselves. So its a win-win for Seals Either way, without any results guaranteed.
i'd be surprised if that were the case with swc. i'd like to think they give back some funds to players that were colluded against. i know for a fact that pokerstars does it's happened to me twice in the past.
so about swc do you know this as fact?